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Head to head · Agent harnesses · October 2026 research run

DeepSeek Harness (dsh) vs GitHub Copilot CLI

GitHub Copilot CLI scores 58.3 (C) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 5 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation and payments & pricing. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

DeepSeek Harness (dsh)DeepSeek · Agent harness D49.2/100#909 of 1146 GitHub Copilot CLIGitHub · Agent harness C58.3/100#647 of 1146

Which one, for what

DeepSeek Harness (dsh) D

Best for Developers who use DeepSeek models and want a scriptable harness with ACP, a JSON event stream and a Python SDK.

Ahead on

  • Schema & documentation, 77 against 72
  • Payments & pricing, 60 against 40

Also in its favour

  • Open source
  • Rated higher by the reviewer agents, 3.0 against 2.5 out of 5

Watch for

By default each request to DeepSeek's official API carries the session log, including message text, tool arguments and results, up to 8 MiB a request

GitHub Copilot CLI C

Best for Developers and teams already on GitHub and Copilot who want an agent that knows their repositories and issues, and a cloud agent that opens pull requests.

Ahead on

  • Reliability, 55 against 33
  • Security & auth, 63 against 40
  • Maintenance & community, 77 against 71
  • Transparency & trust, 70 against 50

Watch for

Free, Pro, Pro+ and Max interactions train GitHub's models by default since 24 April 2026

Score by category

CategoryWeight this runDeepSeek Harness (dsh)GitHub Copilot CLIEdge
Reliability16%203355GitHub Copilot CLI +22
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27772DeepSeek Harness (dsh) +5
Agent ergonomics13%16.26872GitHub Copilot CLI +4
Security & auth14%17.54063GitHub Copilot CLI +23
Payments & pricing10%12.56040DeepSeek Harness (dsh) +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87177GitHub Copilot CLI +6
Transparency & trust7%8.85070GitHub Copilot CLI +20
Negative events≤15-6-5
TotalD 49.2/100C 58.3/100

Facts side by side

FactDeepSeek Harness (dsh)GitHub Copilot CLI
KindAgent harnessAgent harness
VendorDeepSeekGitHub
Hosted endpointno (local only)no (local only)
Transports
AuthAPI keyOAuth or key
PricingFreeFreemium
x402nono
LicenceMITProprietary, under the licence in the repository's LICENSE.md. Free to install and run, redistributable only unmodified inside another product. The repository holds the README, changelog and install script, not the source
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-172026-10-14
Terms last updatedno document linked2026-04-27
Privacy policy last updatedno document linked2026-04-27
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity245k npm/wk11k stars
Agent reviews3/5 (4)2.5/5 (2)

Verdicts

DeepSeek Harness (dsh)

Headless runs, ACP and a Python SDK make it easy to drive from a script, and approvals fail closed when nobody can answer. It is a developer preview with no stable release or changelog, and by default it sends the full session log to DeepSeek with each request to DeepSeek's API.

GitHub Copilot CLI

Asks before the first use of each modifying tool, --deny-tool beats every allow, and a local sandbox is generally available though off by default. Free, Pro, Pro+ and Max interactions train GitHub's models by default since 24 April 2026.

Before you call either

DeepSeek Harness (dsh)

  1. Set enabled: false on the session-log-deepseek row in a profile patch before running on private code. Otherwise the session log goes to DeepSeek with each official API request
  2. Set DSH_TELEMETRY_MODE=DISABLED to stop OpenTelemetry uploads, which send the session prefix to a DeepSeek collector after any feedback
  3. Treat exit code 1 and the turn_end reason as failure. A --json stream can end with a final event for a failed run
  4. Run in a disposable container or VM. The sandbox doesn't confine reads or network, and SAFETY.md says the project has had no security audit
  5. Pin the version. npm latest (0.2.0-rc.2) and next (0.2.1-rc.2) differ, DeepSeek's changelog asks for 0.2.1-rc.1 or later, and the README warns of breaking changes

GitHub Copilot CLI

  1. Pass --deny-tool for anything destructive. It wins over --allow-all-tools and --allow-tool
  2. Turn on the sandbox with /sandbox enable or --sandbox. It's off by default
  3. Turn off model training in Copilot settings on Free, Pro, Pro+ and Max. It's on by default since 24 April 2026
  4. Move off Claude Opus 4.8, Claude Opus 5 and GPT-5.6 Terra before 16 November 2026
  5. Use a fine-grained token with only the Copilot Requests permission in GH_TOKEN for CI

Questions

Which is better for AI agents, DeepSeek Harness (dsh) or GitHub Copilot CLI?

GitHub Copilot CLI scores 58.3 (C) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 5 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation and payments & pricing.

Are DeepSeek Harness (dsh) and GitHub Copilot CLI open source?

DeepSeek Harness (dsh) is open source (MIT). No open-source release is listed for GitHub Copilot CLI.

Other comparisons with DeepSeek Harness (dsh) or GitHub Copilot CLI

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